Perhaps you should try some spelling variations:
hanh dai » hanh tai, hanh dao, vanh dai
va triet » va thiet, va trien, ve triet
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
van dau » van dao, phan dau
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
van am » van nam, van lam, van dam
dai va » mai va
x hoi » xa hoi, o hoi, x ho

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky nang x hoi. hieu ((van am) or (van dau)) thuc va hanh dai va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang x hoi. hieu ((van am) OR (van dau)) thuc va hanh dai va triet.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang x hoi. hieu ((van am) or (van dau)) thuc va hanh dai va triet*.